ATMOSPHERE
Layers of the Atmosphere

Troposphere


Stratosphere


Contains the ozone layer
Mesosphere


Closest to Earth
Meteors burn up
Thermosphere

Ionosphere



Exosphere


Polar auroras
Shuttles
Satellites
http://www.natgeoeducationvideo.com/film/1172/earths-atmosphere
OZONE
What is the Ozone



The Ozone Layer | National Geographic Education
Video
Colorless gas
O3: Three oxygen atoms
 The


oxygen we breath only has two oxygen atoms ( O2)
Located in the stratosphere
Is a greenhouse gas and does help govern Earth’s
climate
Ozone Questions

How is a molecule of ozone different from a
molecule of atmospheric oxygen?
 A.
Atmospheric oxygen has one more oxygen atom
than ozone
 B. Atmospheric oxygen has one less oxygen atom than
ozone.
 C. Oxygen and ozone are the same; they are found at
different layers of the atmosphere
 D. Oxygen is produced by plants; ozone is produced
when oxygen combines with CO2
How was Ozone Created?

See article/picture on the board
Ozone affects in the lower and upper
atmosphere
Lower




Cause rubber to crack
Harmful to plants
Damages lung tissues
Consider pollution
Upper

Absorbs harmful
ultraviolet radiation
from the sun
 UV-B
 Protects
living
organisms
Ozone Questions

Where is ozone considered a pollutant?
 A.
in the upper atmosphere where it blocks the suns
rays
 B. in the mid-atmosphere where it prevents cloud
formation.
 C. in the lower atmosphere where it impairs normal
lung function.
 D. it is a pollutant everywhere it is found.
Ozone Question

What does the ozone layer protect living things
from?
 A.
bad weather
 B. ultraviolet rays
 C. excessive heat
 D. meteors and meteorites
Ozone Depletion
Ozone Hole

Greatest effects are seen at Earth’s
poles
 Antarctic:
ozone hole forms from
September to November
 Artic: ozone hole forms from March to
May
 Not
as bad as Antarctic ozone hole because
the Artic doesn’t experience as cold of
temperatures as Antarctic.
 “The
largest ozone hole ever observed
occurred on 24 September 2006.”
http://ozonewatch.gsfc.nasa.gov/, April 6, 2011
Ozone Depletion
Ozone Hole

Chemical reactions involving chlorine, bromine,
nitrogen, and hydrogen break down the ozone
layer. Also CFCs (chlorofluorocarbons) have
contributed to the break down.



In the winter time at each pole the chlorine and
bromine will gather together, because of the
lower temperatures and less sunlight. Then in the
spring and summer months the sunlight will
increase and start the change reaction of the Cl
and Br breaking down the ozone layer creating a
hole.
Teachers' Domain: Ozone Hole
http://news.nationalgeographic.com/news/20
08/11/081103-ozone-video-vin.html
Ozone Questions

What health issue associated with the ozone hole?
 A.
difficult breathing
 B. fever
 C. skin cancer
 D. nagging cough

Earth’s atmosphere did not originally contain ozone
or oxygen. Where did these gasses come from?
 A.
plants released oxygen which formed ozone in the
upper atmosphere.
 B. animals produced ozone and it has broken down to
become oxygen.
 C. as Earth warmed, oxygen and ozone were released
from the oceans
 D. oxygen is a product of respiration and can form
whenever things decompose.

Life on land did not develop on Earth in abundance
until the sun’s radiation was reduced. When did this
happen?
 A.
when human beings built machines that burn fossil
fuels.
 B. when ozone had been absorbed out of the upper
atmosphere
 C. when plants had an opportunity to live with animals
 D. when enough ozone had built up in the upper
atmosphere